Hi guys! I'm almost 21 weeks soon on my 18 weeks I went to do the ultrasound and the lady told me I…

Hi guys! I'm almost 21 weeks soon on my 18 weeks I went to do the ultrasound and the lady told me I was having a baby girl. But mentioned she couldn't see "clearly" I've already started shopping for my baby girl but now my friends are saying what if it's not a girl since the lady wasn't sure? Should I trust what the lady said or get another ultrasound done? Please help.